1 files changed, 23 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/borrowck-assign-to-andmut-in-borrowed-loc.rs b/src/test/ui/borrowck/borrowck-assign-to-andmut-in-borrowed-loc.rs
new file mode 100644
index 000000000..f7aee2b8a
--- /dev/null
+++ b/src/test/ui/borrowck/borrowck-assign-to-andmut-in-borrowed-loc.rs
@@ -0,0 +1,23 @@
+// Test that assignments to an `&mut` pointer which is found in a
+// borrowed (but otherwise non-aliasable) location is illegal.
+
+struct S<'a> {
+    pointer: &'a mut isize
+}
+
+fn copy_borrowed_ptr<'a>(p: &'a mut S<'a>) -> S<'a> {
+    S { pointer: &mut *p.pointer }
+}
+
+fn main() {
+    let mut x = 1;
+
+    {
+        let mut y = S { pointer: &mut x };
+        let z = copy_borrowed_ptr(&mut y);
+        *y.pointer += 1;
+        //~^ ERROR cannot use `*y.pointer`
+        //~| ERROR cannot assign to `*y.pointer`
+        *z.pointer += 1;
+    }
+}